JP2013216729A - Colored compound, injection molding and decoration part having metallic feeling, and house electric appliance using decoration part - Google Patents

Colored compound, injection molding and decoration part having metallic feeling, and house electric appliance using decoration part Download PDF

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JP2013216729A
JP2013216729A JP2012086118A JP2012086118A JP2013216729A JP 2013216729 A JP2013216729 A JP 2013216729A JP 2012086118 A JP2012086118 A JP 2012086118A JP 2012086118 A JP2012086118 A JP 2012086118A JP 2013216729 A JP2013216729 A JP 2013216729A
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injection
additive
thermoplastic resin
molded product
metal particles
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Michihiro Shima
岐宏 島
Yukako Akeyama
悠香子 明山
Akihiro Umeda
章広 梅田
Tomonao Amayoshi
智尚 天良
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Panasonic Corp
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Panasonic Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a coloring material having a metallic feeling without causing a defective appearance, in an injection molding to be molded with a thermoplastic resin having flaky metal particles and having different thickness, partially.SOLUTION: A colored compound comprises the thermoplastic resin as a main material, and includes flaky metal particles and additives having thixotropy giving function at least.

Description

本発明は、射出成型用熱可塑性樹脂に用いる着色材、添加剤、これらを含有する着色コンパウンド、該コンパウンドを用いた射出成形品からなる加飾部品、及び該加飾部品を用いた家電製品に関する。   The present invention relates to a coloring material, an additive used for a thermoplastic resin for injection molding, a colored compound containing these, a decorative part composed of an injection-molded product using the compound, and a home appliance using the decorative part. .

従来、特に自動車分野、家電分野等において、塗装により熱可塑性射出成形品にメタリック感を付与し、加飾部品として用いてきた。しかし、近年、塗装工程において発生する揮発性有機溶剤を低減する気運が高まってきている。これに伴い、熱可塑性樹脂中にアルミニウム等の燐片状金属粒子を混入して射出成型することにより、塗装の代替とする試みが行われている。   Conventionally, in the automotive field, the home appliance field, etc., a metallic feeling is imparted to a thermoplastic injection molded product by painting, and it has been used as a decorative part. However, in recent years, there is an increasing tendency to reduce volatile organic solvents generated in the painting process. Along with this, attempts have been made to substitute for coating by mixing flaky metal particles such as aluminum in a thermoplastic resin and performing injection molding.

熱可塑性樹脂中にアルミニウム等の燐片状金属粒子を混入して射出成型する際、ボスやリブ等がない平板状の形状に成形する場合には、成形品の表面に配向ムラが認識できないように成形条件を調整して成形すると、熱可塑性樹脂は金型内部を図3のように流れるため、燐片状金属粒子は熱可塑性樹脂の流れに沿って射出成形品の表面に対して略平行に配向する。しかしながら、ボスやリブ等が存在し、厚みが部分的に異なる形状に成形する場合には、金型キャビティ内における熱可塑性樹脂の流れに分流、合流が生じる。合流した後の熱可塑性樹脂は粘弾性が低いことから乱流状態となり、含有する鱗片状金属粒子の配向が部分的に略平行状態にならず、射出成形品の表面が部分的に明度が低下する、あるいは光源角度の変化に伴い明度変化が乏しくなり、十分なメタリック感が得られないなどの外観不良が生じる。   When injection molding is performed by mixing flaky metal particles such as aluminum into a thermoplastic resin, when molding into a flat plate shape without bosses or ribs, uneven orientation on the surface of the molded product may not be recognized. When the molding conditions are adjusted, the thermoplastic resin flows inside the mold as shown in FIG. 3, so that the flaky metal particles are substantially parallel to the surface of the injection molded product along the flow of the thermoplastic resin. Oriented to However, when bosses, ribs, and the like are present and are molded into shapes having partially different thicknesses, a diversion and merging occur in the flow of the thermoplastic resin in the mold cavity. The thermoplastic resin after joining is in a turbulent state due to low viscoelasticity, the orientation of the scale-like metal particles contained is not partially parallel, and the surface of the injection-molded product is partially reduced in brightness. Or a change in brightness due to a change in the light source angle, resulting in poor appearance such as a lack of sufficient metallic feel.

この課題に対し、例えば特許文献1では、鱗片状金属粒子のアスペクト比を30以上とし、かつ射出成形品が有する溝部の深さを規定することで塗装と同様の高いメタリック感を有する成形品を得る手法が開示されている。   For example, Patent Document 1 discloses a molded product having a high metallic feeling similar to that of coating by setting the aspect ratio of the scale-like metal particles to 30 or more and defining the depth of the groove of the injection molded product. Techniques to obtain are disclosed.

特開2009−220545号公報JP 2009-220545 A

しかしながら、特許文献1の方法では、家電製品に用いられるようなボスやリブ等が存在し、部分的に厚みが異なる射出成形品に適用した場合には、外観不良を防止することが困難であった。   However, in the method of Patent Document 1, there are bosses and ribs used for home appliances, and it is difficult to prevent poor appearance when applied to injection molded products having partially different thicknesses. It was.

前記従来の課題を解決するために本発明の着色コンパウンドは、少なくとも燐片状金属粒子と、揺変性付与機能を有する添加剤とを含有し、熱可塑性樹脂を主材として構成されることを特徴とするものである。   In order to solve the above-mentioned conventional problems, the colored compound of the present invention contains at least flaky metal particles and an additive having a thixotropic function, and is mainly composed of a thermoplastic resin. It is what.

本発明は、部分的に異なる厚みの形状を有する射出成形品であっても、含有する鱗片状金属粒子の配向が部分的に略平行状態となり、射出成形品において部分的に明度が低下する、あるいは光源角度の変化に伴い明度変化が乏しくなるなどの外観不良が生じることな
く、メタリック感を有する射出成形品を得ることができる。
Even if the present invention is an injection-molded product having a partially different thickness, the orientation of the scale-like metal particles contained is partially in a substantially parallel state, and the brightness is partially reduced in the injection-molded product. Alternatively, it is possible to obtain an injection-molded article having a metallic feeling without causing appearance defects such as a change in lightness that becomes scarce as the light source angle changes.

射出成形品の断面図Cross section of injection molded product 本発明の実施の形態1における射出成形品を得るための工程図Process drawing for obtaining the injection-molded article in Embodiment 1 of the present invention 金型内部での熱可塑性樹脂の流れを示す図Diagram showing the flow of thermoplastic resin inside the mold

第1の発明は、少なくとも燐片状金属粒子と、揺変性付与機能を有する添加剤とを含有し、熱可塑性樹脂を主材として構成されることを特徴とする着色コンパウンドとしたものである。これにより、射出成形品として部分的に異なる厚みの形状を有するものであっても、射出成形品において部分的に明度が低下する、あるいは光源角度の変化に伴い生じる明度変化が乏しいなどの外観不良が生じることなく、メタリック感を有する射出成形品を得ることができる。   A first invention is a colored compound characterized in that it contains at least flaky metal particles and an additive having a thixotropic function and is composed mainly of a thermoplastic resin. As a result, even if the injection-molded product has a shape with a partially different thickness, the brightness is partially reduced in the injection-molded product, or the lightness change caused by the change in the light source angle is poor. An injection-molded product having a metallic feeling can be obtained without the occurrence of.

第2の発明は、第1の発明の着色コンパウンドを射出成型して得られることを特徴とする射出成形品としたものである。これによって、メタリック感を有する加飾部品を得ることができる。   The second invention is an injection molded product obtained by injection molding the colored compound of the first invention. Thereby, a decorative part having a metallic feel can be obtained.

第3の発明は、第2の発明の加飾部品を用いたことを特徴とする家電製品としたものである。これにより家電製品の外観品位向上を図ることができる。   3rd invention is set as the household appliance characterized by using the decorative component of 2nd invention. As a result, the appearance quality of home appliances can be improved.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(実施の形態1)
実施の形態1では、射出成形品の成形方法について説明する。
(Embodiment 1)
In the first embodiment, a method for molding an injection molded product will be described.

図1は、本発明の第1の実施の形態における射出成形品の断面図であり、図2は、射出成形品を得るための工程図である。   FIG. 1 is a cross-sectional view of an injection molded product according to the first embodiment of the present invention, and FIG. 2 is a process diagram for obtaining an injection molded product.

図1において、射出成形品1は、少なくとも燐片状金属粒子2、揺変性付与機能を有する添加剤3を含有する熱可塑性樹脂4からなる。   In FIG. 1, an injection molded product 1 is composed of a thermoplastic resin 4 containing at least flaky metal particles 2 and an additive 3 having a thixotropic imparting function.

本実施の形態の射出成形品1の製造方法について図2を用いて説明する。   The manufacturing method of the injection molded product 1 of this Embodiment is demonstrated using FIG.

まず、材料の調整について説明する。   First, the material adjustment will be described.

少なくとも、燐片状金属粒子2と、揺変性付与機能を有する添加剤3と、熱可塑性樹脂4のペレットとを、所定割合でタンブルミキサーに投入し、撹拌する。なお、このとき、ヘンシェルミキサー等の混合機を使用することもできる。また、他の添加剤(着色剤、滑剤、等)を投入してもよい。また、燐片状金属粒子2と、熱可塑性樹脂4とを混合機を用いて混合した後、後述する溶融・混練工程において、液体を直接添加する機能を有する押出機を用いて混合することもできる。   At least the flaky metal particles 2, the additive 3 having a thixotropic imparting function, and the pellets of the thermoplastic resin 4 are put into a tumble mixer at a predetermined ratio and stirred. At this time, a mixer such as a Henschel mixer can also be used. Further, other additives (coloring agent, lubricant, etc.) may be added. Further, after the flake metal particles 2 and the thermoplastic resin 4 are mixed using a mixer, they may be mixed using an extruder having a function of directly adding a liquid in the melting / kneading step described later. it can.

次に、熱可塑性樹脂4と燐片状金属粒子2と揺変性付与機能を有する添加剤3との混合材料を押出機のホッパーに投入する。混合材料はスクリューの回転により溶融・混練されながらノズル方向に移送される。ノズル方向に移送された混合材料は、ノズルに取り付けられたダイから押し出される。小さな穴から糸状に押し出された混合材料は水槽で冷却され、ペレタイザーによりペレットにカットされる。   Next, a mixed material of the thermoplastic resin 4, the flaky metal particles 2, and the additive 3 having a thixotropic imparting function is put into a hopper of an extruder. The mixed material is transferred in the nozzle direction while being melted and kneaded by the rotation of the screw. The mixed material transferred in the nozzle direction is extruded from a die attached to the nozzle. The mixed material extruded from the small hole in the form of a thread is cooled in a water tank and cut into pellets by a pelletizer.

次に、射出成形について説明する。   Next, injection molding will be described.

乾燥させて水分を除去したペレットを射出成形機のホッパーに投入する。なお、このとき、熱可塑性樹脂が吸湿性の低い材料であれば、乾燥工程を省くことも可能である。   Pellets that have been dried to remove moisture are put into a hopper of an injection molding machine. At this time, if the thermoplastic resin is a low hygroscopic material, the drying step can be omitted.

混合材料は、シリンダー内でスクリューの回転により溶融・混練されながらノズル方向に移送される。金型を閉じた状態とし、混合材料を金型のキャビティ内に射出する。混合材料が金型のキャビティ内全体に充填して、金型を冷却し、混合材料を固化し、金型を開いて、射出成形品1を取り出す。   The mixed material is transferred in the nozzle direction while being melted and kneaded by rotation of the screw in the cylinder. The mold is closed and the mixed material is injected into the mold cavity. The mixed material fills the entire cavity of the mold, the mold is cooled, the mixed material is solidified, the mold is opened, and the injection molded product 1 is taken out.

このとき、射出成形品1の表面に燐片状金属粒子の配向ムラが目視で認識できないようにするために、金型温度、シリンダー温度、射出速度、射出圧力、保圧時間、冷却時間等の各条件を、熱可塑性樹脂の種類、燐片状金属粒子の種類や添加量等に応じて、適宜調整する。   At this time, in order to prevent the uneven orientation of the flaky metal particles from being visually recognized on the surface of the injection molded product 1, the mold temperature, cylinder temperature, injection speed, injection pressure, pressure holding time, cooling time, etc. Each condition is appropriately adjusted according to the type of thermoplastic resin, the type and amount of the flaky metal particles, and the like.

本発明に用いる熱可塑性樹脂としては、射出成型可能な熱可塑性樹脂であれば特に限定することなく使用できる。熱可塑性樹脂の具体例としては、ポリエチレン、ポリプロピレン、ポリスチレン、ABS、メチルメタクリレート、ポリアミド、ポリエチレンテレフタレート、ポリブチレンテレフタレート、塩化ビニル等の樹脂が挙げられる。   As the thermoplastic resin used in the present invention, any thermoplastic resin that can be injection-molded can be used without particular limitation. Specific examples of the thermoplastic resin include resins such as polyethylene, polypropylene, polystyrene, ABS, methyl methacrylate, polyamide, polyethylene terephthalate, polybutylene terephthalate, and vinyl chloride.

また、本発明に用いる燐片状金属粒子としては、アトマイズにより得られた金属粒子を圧延した後、磨き処理して得られるアルミニウム粒子、透明樹脂もしくはフッ化マグネシウム等のハロゲン化金属化合物からなる層間に蒸着により積層されたアルミニウム層を含有する粒子、鉄を主成分とし、クロム、ニッケルを含有する金属粒子等を使用できる。   In addition, as the flaky metal particles used in the present invention, the metal particles obtained by atomization are rolled and then subjected to a polishing treatment between aluminum particles, a transparent resin or a metal halide compound such as magnesium fluoride. It is possible to use particles containing an aluminum layer laminated by vapor deposition, metal particles containing iron as a main component, and containing chromium and nickel.

これらの燐片状金属粒子を金属酸化物等により被覆することも可能であるが、特に指定するものではなく、求める外観、コスト、等から自由に選択できる。また、複数種の燐片状金属粒子を混合して使用することも可能である。   These flaky metal particles can be coated with a metal oxide or the like, but are not particularly specified, and can be freely selected from the required appearance, cost, and the like. It is also possible to use a mixture of multiple types of flake metal particles.

燐片状金属粒子の混合量は、所望する成形品の色調に応じて調整するものであって、限定できるものではないが、0.5重量部以上、6.0重量部以下の範囲において、均一な配向の射出成形品を得ている。   The amount of the flaky metal particles mixed is adjusted according to the desired color tone of the molded product and is not limited. However, in the range of 0.5 parts by weight or more and 6.0 parts by weight or less, Uniformly oriented injection molded products are obtained.

また、所望の色調を得るために、燐片状金属粒子以外の着色剤を有していてもよい。着色剤はマイカ、ガラスフレーク等のパール材、有機顔料、無機顔料、染料等、特に指定するものではない。   Moreover, in order to obtain a desired color tone, a colorant other than the flake shaped metal particles may be included. The colorant is not particularly specified, such as pearl materials such as mica and glass flakes, organic pigments, inorganic pigments and dyes.

発明に用いる揺変性付与機能を有する添加剤としては、変性ウレア、水素添加ひまし油ワックス、酸化ポリエチレン、アマイドワックス、重合アマニ油、ダイマ酸エステル、硫酸化物アミン塩、アマイドワックスと酸化ポリエチレンとの混合物等を用いることができる。揺変性付与機能を有する添加剤の混合量は、材料毎によって異なるため、限定できるものではないが、変性ウレアを35重量%含有する揺変性付与機能を有する添加剤では、0.5重量部以上、3.0重量部以下の範囲において、均一な配向の成形品を得ている。なお、揺変性付与機能を有する添加剤と揺変性付与機能を有さない添加剤とを併用することも可能である。   Examples of additives having a thixotropic imparting function used in the invention include modified urea, hydrogenated castor oil wax, oxidized polyethylene, amide wax, polymerized linseed oil, dimer acid ester, sulfate amine salt, a mixture of amide wax and oxidized polyethylene, etc. Can be used. The mixing amount of the additive having a thixotropic imparting function varies depending on the material and is not limited. However, in the additive having a thixotropic imparting function containing 35% by weight of modified urea, 0.5 parts by weight or more In the range of 3.0 parts by weight or less, a molded product having a uniform orientation is obtained. In addition, it is also possible to use together the additive which has a thixotropic provision function, and the additive which does not have a thixotropic provision function.

また、本発明の着色ペレットは、付与したい機能に合わせて、繊維状フィラー、酸化防止剤、紫外線吸収剤、難燃剤、抗菌剤等を有していてもよい。   Moreover, the colored pellets of the present invention may have a fibrous filler, an antioxidant, an ultraviolet absorber, a flame retardant, an antibacterial agent, and the like according to the function to be imparted.

また、本実施の形態では、着色の方法として着色ペレットを例に挙げて説明したが、着色の方法は、マスターバッチ、ドライカラー等、特に指定するものではない。   Further, in the present embodiment, the coloring pellet is described as an example of the coloring method, but the coloring method is not particularly specified such as a masterbatch or a dry color.

また、本実施の形態では、射出成形品の形状は、品位をより精度よく評価するために、部分的に厚みを変化させた平板状(ボスやリブがない形状)に形成したが、形状は特に指定するものではない。   In this embodiment, the shape of the injection-molded product is formed in a flat plate shape (a shape without bosses or ribs) partially changed in thickness in order to evaluate the quality more accurately. Not particularly specified.

(実施の形態2)
実施の形態2では、品位の評価方法について説明する。
(Embodiment 2)
In the second embodiment, a quality evaluation method will be described.

目視により、射出成形品の明度の均一度を官能的に評価した。得られた射出成形品の配向状態について、50cm離れた状態で視認できるレベルを1とし、全く視認できないレベルを5として5段階に官能評価した。   The uniformity of lightness of the injection-molded product was sensoryly evaluated by visual inspection. The orientation state of the obtained injection-molded product was subjected to sensory evaluation in five stages, with 1 being a level that can be visually recognized at a distance of 50 cm and 5 being a level that cannot be seen at all.

実施例または比較例に用いる主な原材料を一括して挙げれば以下のとおりである。
<熱可塑性樹脂>
(1)ユーエムジー・エービーエス社製 U400(M.V.R 3g/10分)
(2)東レ社製ABS樹脂 AX05X03(M.F.R 15g/10分)
(3)ユーエムジー・エービーエス社製 EX18Z(M.V.R 22g/10分)
(4)東レ社製ABS樹脂 AX05X08(M.F.R 29g/10分)
(5)東レ社製ABS樹脂 700―X01(M.F.R 40g/10分)
(6)東レ社製ABS樹脂 250―X10(M.F.R 48g/10分)
<燐片状金属粒子>
(7)東洋アルミニウム社製 メタックスネオ N1 (平均粒子径 5ミクロン)
(8)東洋アルミニウム社製 メタックスネオ N9 (平均粒子径 20ミクロン)
(9)東洋アルミニウム社製 メタックスネオ T5 (平均粒子径 17ミクロン)
(10)東洋アルミニウム社製 メタックスネオ T1 (平均粒子径 27ミクロン)(11)エカルト社製 マスターセーフ MP15−20 (平均粒子径 15ミクロン)
(12)エカルト社製 マスターセーフ MP16−20 (平均粒子径 16ミクロン)
(13)エカルト社製 マスターセーフ MP29−20 (平均粒子径 29ミクロン)
(14)尾池イメージング社製 エルジーネオ #325 (平均粒子径 44ミクロン)
(15)尾池イメージング社製 エルジーネオ #500 (平均粒子径 30ミクロン)
(16)JDSU社製 SpectraFlair (平均粒子径 20ミクロン)
<揺変性機能付与剤>
(17)楠本化成社製 ウレア系沈降防止剤ディスパロンGT―1001(主成分 変性ウレア)
(18)共栄社化学社製 タレ止め・沈降防止剤 フローノンSA―300H(主成分 酸化ポリエチレン)
<顔料分散剤>
(19)カチオン性高分子分散剤 日本ルーブリゾール社製 SOLPLUS DP320
(20)アニオン性高分子分散剤 ビックケミ―・ジャパン製 BYK−P4102
(21)両極性分散剤 味の素ファインケミカル社製 アジスパーPB821
<カップリング剤>
(22)アルミニウム系カップリング剤 味の素ファインケミカル社製 ブレンアクトAL−M
[射出成形品の評価結果]
表1は、1種類の添加剤を混合した射出成形品からなる加飾部品(P1〜P30)の構成及び明度の均一度を評価した結果を示す。表2は、複数種類の添加剤を混合した射出成形品からなる加飾部品(P31〜P60)の構成及び明度の均一度を評価した結果を示す。表1及び表2の「熱可塑性樹脂」、「光輝剤」、「添加剤」の欄中に記載した(1)〜(22)は、上述した原材料の番号を示す。
It is as follows if the main raw materials used for an Example or a comparative example are mentioned collectively.
<Thermoplastic resin>
(1) U400 manufactured by UMG ABS Co., Ltd. (MV R 3 g / 10 min)
(2) ABS resin manufactured by Toray Industries, Inc. AX05X03 (MF 15 g / 10 min)
(3) EX18Z (MV VR 22g / 10min) manufactured by UMG AB
(4) ABS resin manufactured by Toray Industries, Inc. AX05X08 (MF R 29 g / 10 min)
(5) ABS resin 700-X01 (MF R 40 g / 10 minutes) manufactured by Toray Industries, Inc.
(6) ABS resin 250-X10 (MF R 48 g / 10 min) manufactured by Toray Industries, Inc.
<Flaky metal particles>
(7) Metax Neo N1 manufactured by Toyo Aluminum Co., Ltd. (average particle size 5 microns)
(8) Metax Neo N9 manufactured by Toyo Aluminum Co., Ltd. (average particle size 20 microns)
(9) Toyo Aluminum Co., Ltd. Metax Neo T5 (average particle size 17 microns)
(10) Metax Neo T1 (average particle size 27 microns) manufactured by Toyo Aluminum Co., Ltd. (11) Master Safe MP15-20 (average particle size 15 microns) manufactured by Ecart Co.
(12) Master safe MP16-20 (average particle size 16 microns) manufactured by Ecart Co.
(13) Master safe MP29-20 (average particle size 29 microns) manufactured by Ecart Co.
(14) Elgeneo # 325 manufactured by Oike Imaging Co. (average particle size 44 microns)
(15) Elgeneo # 500 (average particle size 30 microns) manufactured by Oike Imaging
(16) SpectraFlair (average particle size 20 microns) manufactured by JDSU
<Thixotropic agent>
(17) Urea-based anti-settling agent Disparon GT-1001 (main component modified urea) manufactured by Enomoto Kasei Co., Ltd.
(18) Anti-sagging agent and anti-settling agent by Kyoeisha Chemical Co., Ltd. Flownon SA-300H (main component: polyethylene oxide)
<Pigment dispersant>
(19) Cationic polymer dispersant SOLPLUS DP320 manufactured by Nippon Lubrizol Corporation
(20) BYK-P4102 manufactured by Big Chemie Japan
(21) Bipolar dispersant Ajinomoto Fine Chemical Co., Ltd. Addispar PB821
<Coupling agent>
(22) Aluminum coupling agent Blenact AL-M manufactured by Ajinomoto Fine Chemical Co., Ltd.
[Evaluation results of injection molded products]
Table 1 shows the results of evaluating the configuration and brightness uniformity of decorative parts (P1 to P30) made of injection-molded products mixed with one type of additive. Table 2 shows the results of evaluating the configuration and brightness uniformity of decorative parts (P31 to P60) made of injection molded products in which a plurality of types of additives are mixed. (1) to (22) described in the columns of “thermoplastic resin”, “brighting agent”, and “additive” in Tables 1 and 2 indicate the numbers of the raw materials described above.

本発明に係る加飾部品は、少なくとも燐片状金属粒子と、揺変性付与機能を有する添加剤と、熱可塑性樹脂からなる加飾部品であることを特徴とするものである。   The decorative part according to the present invention is characterized in that it is a decorative part comprising at least flaky metal particles, an additive having a thixotropic imparting function, and a thermoplastic resin.

揺変性付与機能を有する添加剤を用いた場合、明度の均一度の官能評価結果が3以上となり、良好な配向状態の射出成形品を得た。特に、変性ウレアを主成分とする揺変性付与機能を有する添加剤を用いた場合は、明度の均一度の官能評価結果が4以上となり、十分なメタリック感を有する射出成形品を得ることができた。   When an additive having a thixotropic imparting function was used, the sensory evaluation result of lightness uniformity was 3 or more, and an injection-molded product having a good orientation state was obtained. In particular, when an additive having a thixotropic imparting function mainly composed of modified urea is used, the sensory evaluation result of brightness uniformity is 4 or more, and an injection molded product having a sufficient metallic feeling can be obtained. It was.

この効果は、揺変性付与機能を有する添加剤の量に比例して増大したものの、過度に添加すると溶融・混練加工性が低下した。   Although this effect increased in proportion to the amount of additive having a thixotropic imparting function, melting and kneading processability decreased when excessively added.

また、揺変性付与機能を有する添加剤と揺変性付与機能を有さない添加剤とを併用した場合には、添加剤の総量を5.0重量部以下にすると同様に良好な結果を得ることができた。一方で、揺変性付与機能を有する添加剤と揺変性付与機能を有さない添加剤とを併用する場合、添加剤の総量を5.0重量部以上にすると、加工性の低下に加えて、射出成形品に、いわゆるシルバーストリーク等の成形不良が発生し、良品を得ることができなかった。   In addition, when an additive having a thixotropic function and an additive not having a thixotropic function are used in combination, good results can be obtained when the total amount of the additive is 5.0 parts by weight or less. I was able to. On the other hand, when the additive having a thixotropic imparting function and the additive not having the thixotropic imparting function are used in combination, when the total amount of the additive is 5.0 parts by weight or more, in addition to a decrease in workability, A molding defect such as so-called silver streak occurred in the injection molded product, and a good product could not be obtained.

このことは、射出された熱可塑性樹脂が、キャビティ内で異なる流れの樹脂と合流し、流動が低減した時点で、熱可塑性樹脂中に含有される揺変性付与機能を有する添加剤が互いに結びつき、網目状構造物を形成することにより、熱可塑性樹脂の溶融粘度を急速に回復させ、系全体をゲル化し、略平行状態にある燐片状金属粒子の配向状態を保全することに起因する。   This is because when the injected thermoplastic resin merges with a resin of a different flow in the cavity and the flow is reduced, the additives having a thixotropic imparting function contained in the thermoplastic resin are combined with each other, By forming the network structure, the melt viscosity of the thermoplastic resin is rapidly recovered, the entire system is gelled, and the orientation state of the flaky metal particles in a substantially parallel state is maintained.

一方、揺変性付与機能を有する添加剤を添加しない場合には、揺変性付与機能を有さない添加剤のみを単種で、もしくは複数種を併用して用いると、射出成形品中において燐片状金属粒子の配向が保全されず、射出成形品において部分的に明度が低下する、あるいは光源角度の変化に伴い生じる明度変化が乏しいなどの外観不良が生じ、メタリック感を有する射出成形品を得ることができなかった。このとき、明度の均一度の官能評価結果は2以下であった。   On the other hand, when an additive having a thixotropic function is not added, only an additive that does not have a thixotropic function is used alone, or a combination of a plurality of kinds is used. The orientation of the metal particles is not preserved, resulting in poor appearance such as a partial decrease in brightness in the injection-molded product, or a lack of brightness change caused by changes in the light source angle, and an injection-molded product having a metallic feeling is obtained. I couldn't. At this time, the sensory evaluation result of brightness uniformity was 2 or less.

以上のように、本発明にかかる着色コンパウンドは、十分なメタリック感を有する射出成形品を得ることができ、自動車分野、家電分野等、デザイン性を重視する加飾部品に利用することができる。   As described above, the colored compound according to the present invention can provide an injection-molded product having a sufficient metallic feeling, and can be used for decorative parts that place importance on design, such as in the automobile field and the household appliance field.

1 射出成形品
2 燐片状金属粒子
3 揺変性付与機能を有する添加剤
4 熱可塑性樹脂
DESCRIPTION OF SYMBOLS 1 Injection molded product 2 Sintered metal particle 3 Additive which has thixotropy provision function 4 Thermoplastic resin

Claims (6)

少なくとも燐片状金属粒子と、揺変性付与機能を有する添加剤とを含有し、熱可塑性樹脂を主材とする着色コンパウンド。 A coloring compound containing at least flaky metal particles and an additive having a thixotropic imparting function and mainly comprising a thermoplastic resin. 揺変性付与機能を有する添加剤がウレア結合を有することを特徴とする、請求項1に記載の着色コンパウンド。 The coloring compound according to claim 1, wherein the additive having a thixotropic function has a urea bond. 揺変性付与機能を有する添加剤が液状であることを特徴とする、請求項1もしくは2に記載の着色コンパウンド。 The coloring compound according to claim 1 or 2, wherein the additive having a thixotropic imparting function is liquid. 請求項1から3のいずれかに記載の着色コンパウンドを用いたことを特徴とするメタリック感を有する射出成形品。 An injection-molded article having a metallic feeling, wherein the colored compound according to any one of claims 1 to 3 is used. 請求項4に記載の射出成形品からなるメタリック感を有する加飾部品。 A decorative part having a metallic feel made of the injection-molded product according to claim 4. 請求項5に記載の加飾部品を用いたことを特徴とする家電製品。 A home electric appliance using the decorative component according to claim 5.
JP2012086118A 2012-04-05 2012-04-05 Colored compound, injection molding and decoration part having metallic feeling, and house electric appliance using decoration part Pending JP2013216729A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104441401A (en) * 2014-11-04 2015-03-25 长春富维—江森自控汽车饰件系统有限公司 Free-spraying metallic-luster injection molding process for car interior trim parts and exterior parts
CN114514284A (en) * 2019-10-18 2022-05-17 本田技研工业株式会社 Resin composition, resin molded article comprising same, and method for producing resin molded article

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104441401A (en) * 2014-11-04 2015-03-25 长春富维—江森自控汽车饰件系统有限公司 Free-spraying metallic-luster injection molding process for car interior trim parts and exterior parts
CN114514284A (en) * 2019-10-18 2022-05-17 本田技研工业株式会社 Resin composition, resin molded article comprising same, and method for producing resin molded article

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